1. Natural Products Laboratory, Division of Medicinal Chemistry and Natural Products, School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7360, Niigata College of Pharmacy, 5-13-2 Kamishinei-cho, Niigata, 950-21 Japan, Biotech Research Laboratories, 217 Perry Parkway, Gaithersburg, Maryland 20877, Department of Microbiology, Meharry Medical College, West Basic Science Building, Nashville, Tennessee 37208, and National Research Institute of Chinese Medicine,...